ST 3254.X – ST 3214.X

Electrodeless 4-20mA Loop Conductivity Sensors

ST 3254.1 0/10 mS range
ST 3254.2 0/100 mS range
ST 3254.3 0/1000 mS range
ST 3214.4 0/20 mS range
ST 3214.5 0/200 mS range
ST 3214.6 0/2000 mS range

On request, a model with range 0/300 mS is available.

This E. Conductivity sensor consists of a loop powered transmitter and an electrodeless conductivity sensor in a single package. Temperature compensation is accomplished with a built-in sensor. Applications include water treatment, cooling tower and water monitoring.

Six models are available for specific measuring range.

Principle of operation

When the electrodeless conductivity sensor is immersed in the sample to be measured, a conductive loop is created through the two toroidally wound coils. An alternating current is applied to one of the coils which induces a current in the conductive loop. The second coil is used to measure the conductivity which is proportional to the induced current in the solution. The advantages of he electrodeless method are more apparent in measurement applications in which electrodes contamination and polarization of a conventional conductivity system can lead to erroneous readings.

Each sensor contains:

  • two measuring toroidal coils
  • temperature sensor
  • 4-20 mA current loop amplifier

Technical Specifications Sheet

Please find a detailed Technical Specifications Sheet for this product by clicking the link below.